Metals and nonmetals and the economic importance of some metals and nonmetals
Every day, we can see the matter around us which has a mass and a volume. The matter may exist as an element or a compound, The element is the simplest form of the matter that can not be analyzed into two substances or more.
|There are 112 elements.|
118 elements have been discovered up till now. and they are divided into the natural elements (they are 92 elements) and the artificial elements (they are 26 elements).
The elements molecules are formed of similar atoms that are different from those of the other elements.
The metals are solids except mercury which is liquid. The solid metals as copper, aluminium, lead, gold and silver.
The properties of the metals
The metals are shiny. and they have metallic luster if they are pure.
They are good conductors of electricity.
They have high melting and boiling point.
They can be bend, They are malleable, and they can be hammered to form sheets.
They are solids such as sulphur, carbon and phosphorous. They are liquids such as bromine, and they are gases such as oxygen and nitrogen.
The properties of the non-metals
They do not have a metallic luster, They are not shiny.
They are not malleable or they can not be hammered. They can not be bend.
They are bad conductors of electricity except carbon.
They have low melting and boiling points.
Some metals and non-metals economic importance
Iron is very important in making the bridges, the car chassis (the car frames), the doors and the sheet lights (The lamp posts), and it is a metal.
Copper is very important in making the electric wires, the statues and the metallic coins, and it is a metal.
Aluminium is very important in the manufacture of the cooking pans, The foil paper and some doorknobs, And it is a metal.
Gold and silver are used in making jewellery, and they are metals.
Carbon (graphite) is used in making of the positive electrodes (The poles) of the dry batteries (the cells), and it is non-metal.
Mercury metal is used in making of the thermometers.